lkml.org 
[lkml]   [2023]   [Aug]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 1/3] hwmon: pmbus: Reduce clear fault page invocations
Date
From: Patrick Rudolph <patrick.rudolph@9elements.com>

Observing I2C traffic revealed consecutive transmission of CLEAR_FAULT
commands. While this doesn't cause issues, it extends driver probe time.

Avoid invoking pmbus_clear_fault_page for virtual registers, as they're
managed by the driver, not the chip.

TEST: Verified using an I2C bus analyzer that only one CLEAR_FAULT
command is send instead 5 in a row.

Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Signed-off-by: Naresh Solanki <Naresh.Solanki@9elements.com>
---
drivers/hwmon/pmbus/pmbus_core.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
index 69a4e62b6c8d..cbfabdd69056 100644
--- a/drivers/hwmon/pmbus/pmbus_core.c
+++ b/drivers/hwmon/pmbus/pmbus_core.c
@@ -561,7 +561,8 @@ static bool pmbus_check_register(struct i2c_client *client,
rv = pmbus_check_status_cml(client);
if (rv < 0 && (data->flags & PMBUS_READ_STATUS_AFTER_FAILED_CHECK))
data->read_status(client, -1);
- pmbus_clear_fault_page(client, -1);
+ if (reg < PMBUS_VIRT_BASE)
+ pmbus_clear_fault_page(client, -1);
return rv >= 0;
}

base-commit: fc8df28be7155ddcf8731b4c85fd3372811ba5ac
--
2.41.0

\
 
 \ /
  Last update: 2023-08-17 11:26    [W:0.042 / U:1.900 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site